As of 6:51 p.m., officials say the fire burning on the Napa-Sonoma County line has burned 116 acres with 80% containment.
The brush fire broke out at around 2:30 p.m. near Fremont Drive and Napa Road in the town of Schellville.
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No evacuations are ordered but there were some traffic delays.
Traffic on Highway 121 heading west at the Napa-Sonoma County line was delayed.
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Stay with ABC7 News on this developing story.